Events emitted in the controller

The controller is currently emitting events which are "duplications" of events emitted in the avatar, reputation, and token.
Those are removed in #532. I think this needs to be reconsidered.
Especially upon thinking about the option of caching contracts.

@orenyodfat @dev-matan-tsuberi

Start by reviewing the event handling in the controller, avatar, reputation, and token contracts, then read the removal described in #532. The issue names no files or tests; done requires an agreed decision on whether controller events are needed for contract caching and corresponding implementation updates.

Written by the indexing model from the issue text.